resource creation in wrong subscription

[flexwie]

I am trying to solve the same problem that is answered in this post with Terraspace.

My .env file has both ARM_SUBSCRIPTION_ID set for the subscription that is supposed to hold the resources and ARM_BACKEND_SUBSCRIPTION_ID for the subscription where we are storing our terraform state.

My backend config looks like this:

terraform {
  backend "azurerm" {
    resource_group_name  = "<Name>"
    storage_account_name = "<%= expansion('<NAME>:ENV') %>"
    container_name       = "terraform-state"
    key                  = "<%= expansion(':PROJECT/:LOCATION/:APP/:ROLE/:ENV/:BUILD_DIR/terraform.tfstate') %>"
    subscription_id      = "<%= expansion(':ARM_BACKEND_SUBSCRIPTION_ID') %>"
  }
}

Yet the builder tries to find and create the resource group and storage account in the subscription set in ARM_SUBSCRIPTION_ID. I don't know Ruby but from scanning the code in here it seems that the subscription parameter from the backend block is not read anywhere.